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National Drinking Water Database


Trichloroethylene in Delaware


Trichloroethylene is used to remove grease from fabricated metal parts and in the production of some textiles; this pollutant comes from metal degreasing sites, metal finishing and rubber processing industries. [read more]

The Most Polluted Communities in Delaware

5 water utilities reported detecting Trichloroethylene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Trichloroethylene level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Millsboro Water Department
Millsboro, DE
2,30077 of 913.85 ppb
(0 to 14.83 ppb)
2Dagsboro Water Dept
DE
5006 of 250.45 ppb
(0 to 3.97 ppb)
3Wild Quail District
Dover, DE
7928 of 180.22 ppb
(0 to 0.64 ppb)
4Artesian Water Company
Newark, DE
201,00017 of 1340.06 ppb
(0 to 1.75 ppb)
5Newark Water Department
Newark, DE
36,1302 of 150.02 ppb
(0 to 0.14 ppb)

Health Based Limits for Trichloroethylene

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.03 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.1.7 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.3 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.200 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.300 ppb

Violation Summary for Trichloroethylene in Delaware

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Delaware since 2004

Violation TypeNumber of Violations
Over maximum contaminant level, Average1